I'm an AK noob just getting to know a Zastava M92. When it came out of the box, I noticed the handguard on the gas tube was cocked so there was a bigger gap on the right than on the left. Got on youtube and learned that you roll that handguard 180 degrees around the gas tube to remove. I did not have the grip strength to move it on the gun, but when I removed the gas tube and held the receiver end with a wrench, I could move the wood a few degrees in the right direction to even out the gap.
Then, of course, I removed all the wood and stuck a Manticore renegade on it. The little lever that retains the bottom wood or the renegade is another story, but I really like the renegade. Sven does nice work!
As others have said, don't sweat the wood fit because you'll likely want to mod it anyway.